Absorption and emission spectroscopic characterization of some azo dyes and a diamino-maleonitrile dye |
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Authors: | T Susdorf AK Bansal A Penzkofer Sheng-Li Guo Jing-Min Shi |
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Institution: | 1. Institut II – Experimentelle und Angewandte Physik, Universität Regensburg, Universitätstrasse 31, D-93053 Regensburg, Germany;2. Department of Physics, Nanjing University of Information Science and Technology, Nanjing 210044, PR China;3. Department of Chemistry, Shandong Normal University, Jinan 250000, PR China |
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Abstract: | A linear and nonlinear optical spectroscopic characterization is carried out on three azo dyes (Reactive orange 1, Reactive violet 8, and Acidproof purplish red), and on N-(p-hydroxybenzylidene)-diamino-maleonitrile. Fluorescence quantum distributions, fluorescence quantum yields, and fluorescence lifetimes are measured. The saturable absorption is studied by nonlinear transmission measurements with intense picosecond laser pulses. The ground-state absorption recovery is studied by picosecond time-resolved pump and probe measurements. Absolute ground-state absorption cross-sections, excited-state absorption cross-sections, and dye concentrations are extracted from saturable absorption studies. The azo dyes have fluorescence lifetimes and ground-state absorption recovery times of around 2 ps and their excited-state absorption cross-sections are small (measured at 527 nm) making them good mode-locking dyes for picosecond and femtosecond lasers. The investigated diamino-maleonitrile dye exhibits sub-picosecond fluorescence lifetime and slow ground-state absorption recovery (>1 ns). |
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Keywords: | Reactive violet 8 Reactive orange 1 Acidproof purplish red Maleonitrile dye Fluorescence up-conversion Pump&ndash probe spectroscopy Absorption spectroscopy Fluorescence spectroscopy Saturable absorption Ground-state absorption cross-section Excited-state absorption cross-section Fluorescence lifetime Absorption recovery time |
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